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Fluoro Nitrenoid Complexes FN=MF2 (M=Co, Rh, Ir): Electronic Structure Dichotomy and Formation of Nitrido Fluorides N?MF3.

ABSTRACT: The fluoronitrenoid metal complexes FNCoF2 and FNRhF2 as well as the first ternary RhVI and IrVI complexes NIrF3 and NRhF3 are described. They were obtained by the reaction of excited Group-9 metal atoms with NF3 and their IR spectra, isolated in solid rare gases (neon and argon), were recorded. Aided by the observed 14/15 N isotope shifts and quantum-chemical predictions, all four stretching fundamentals of the novel complexes were safely assigned. The F-N stretching frequencies of the fluoronitrenoid complexes FNCoF2 (1056.8?cm-1 ) and FNRhF2 (872.6?cm-1 ) are very different and their N-M bonds vary greatly. In FNCoF2 , the FN ligand is singly bonded to Co and bears considerable iminyl/nitrene radical character, while the N-Rh bond in FNRhF2 is a strong double bond with comparatively strong ?- and ?-bonds. The anticipated rearrangement of FNCoF2 to the nitrido CoVI complex is predicted to be endothermic and was not observed.

SUBMITTER: Stuker T 

PROVIDER: S-EPMC7756499 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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Fluoro Nitrenoid Complexes FN=MF<sub>2</sub> (M=Co, Rh, Ir): Electronic Structure Dichotomy and Formation of Nitrido Fluorides N≡MF<sub>3</sub>.

Stüker Tony T   Hohmann Thomas T   Beckers Helmut H   Riedel Sebastian S  

Angewandte Chemie (International ed. in English) 20201015 51

The fluoronitrenoid metal complexes FNCoF<sub>2</sub> and FNRhF<sub>2</sub> as well as the first ternary Rh<sup>VI</sup> and Ir<sup>VI</sup> complexes NIrF<sub>3</sub> and NRhF<sub>3</sub> are described. They were obtained by the reaction of excited Group-9 metal atoms with NF<sub>3</sub> and their IR spectra, isolated in solid rare gases (neon and argon), were recorded. Aided by the observed <sup>14/15</sup> N isotope shifts and quantum-chemical predictions, all four stretching fundamentals of  ...[more]

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